83780581 has 2 divisors, whose sum is σ = 83780582. Its totient is φ = 83780580.

The previous prime is 83780563. The next prime is 83780621. The reversal of 83780581 is 18508738.

It is an a-pointer prime, because the next prime (83780621) can be obtained adding 83780581 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83722500 + 58081 = 9150^2 + 241^2 .

It is a cyclic number.

It is not a de Polignac number, because 83780581 - 2¹⁵ = 83747813 is a prime.

It is a super-2 number, since 2×83780581² = 14038371505395122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (83780551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41890290 + 41890291.

It is an arithmetic number, because the mean of its divisors is an integer number (41890291).

Almost surely, 2^83780581 is an apocalyptic number.

It is an amenable number.

83780581 is a deficient number, since it is larger than the sum of its proper divisors (1).

83780581 is an equidigital number, since it uses as much as digits as its factorization.

83780581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 83780581 is about 9153.1732748812. The cubic root of 83780581 is about 437.5702522287.

It can be divided in two parts, 837 and 80581, that added together give a palindrome (81418).

The spelling of 83780581 in words is "eighty-three million, seven hundred eighty thousand, five hundred eighty-one".